Exercise 1 You should start a do-file where you collect all the commands, so you can replicate the analysis at a later date. The data we use comes from the paper Americans do I.T better: US ...

A two-valued qualitative variable can be represented by a single 0-or-1-valued "dummy" variable. If a qualitative variable has three or more possible values (e.g., make-of-car, or marital-status), ...

The American Statistician strives to publish articles of general interest to the statistical profession on topics that are important for a broad group of statisticians, and ordinarily not highly ...

A "Seasonal Dummies" predictor is a special feature that adds to the model seasonal indicator or "dummy" variables to serve as regressors for seasonal effects. A Seasonal Dummies input is added to the ...